(updated/ignore) - Apparently I didn't have on the messages that send updates to learners....so this does exist. whoops.
When a learner enrolls into an ILC session they get a calendar invite in 2 ways (1-on the registration screen as a button, 2 - if set up as a session confirmation email)
HOWEVER….. if they change their session date in the system, they get the first option to click the add to calendar button, but they do not get a second (new) session confirmation email.
My users are looking for this second email and it is useful if you have other important information in that message besides just a date (e.g. we use it as receipt)